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DA 140

Chapter 35 Lab materials & techniques

Articulator Replicate the movement of the jaw/joints. Used with models to study malocclusion
Spacer and stopper Thin liner/divider between maxillary and mandibular arches for custom fit. Can be wax, foil or wax paper
Undercut Recessed areas in the model that make it impossible to seat or remove custom tray properly; caused by bubbles in plaster, cavities or shape of arch or dentition
Final Impression Silicone impression that is sent to the lab
Custom tray Molded and fit specific for one person
Die Positive replica of the prepared tooth made from stone/plaster
Triple tray
Dimensional stability Durability and strength
Preliminary impression Done by assistant, poor dimensional quality and stability
Alginate impressions Make a negative mold
Created by: cadengel